Boing BoingDo IT workers dream of electric sheep? This hilarious site compiles the nightmares and dreams of coders.
One of the scariest nightmares I've had in the past decade or so was about me being stuck in a Nethack dungeon. Everything was green on black (I'd been playing on a Facit VT100-clone) and in 7-bit ASCII. I distinctly remember being chased by a lower-case x, scared out of my wits and at the same time feeling ashamed of being such a wimp that a mere grid bug was a threat.
I have a lot of weird dreams. Sometimes I'm a contract that's being negotiated. Sometimes, I see everything in gritty black and white.